Panasonic SAAK-177 Service manual
ORDER NO. MD0105111C3
CD Stereo System
SA-AK177
Colour
(S)... Silver Type
Area
(GC)...Asia, Latin America, Africa and Middle Near East
TAPE SECTION :
AR2 MECHANISM SERIES
CD SECTION :
RAE0152Z-3 TRAVERSE DECK SERIES
1 2005-05-13
SPECIFICATIONS
AMPLIFIER SECTION
PMPO 3000 W
RMS power output
THD 10%, both channels
driven
Front 80 Hz (Low channel) 75 W per channel (8 )
Front 1 kHz (High
channel)
Center 1 kHz 100 W (8 )
Surround 1 kHz 35 W per channel (8 )
Total power output in
Dolby Pro Logic mode
RMS power output
THD 10%, both channels
driven
80 Hz (Low channel) 75 W per channel (8 )
1 kHz (High channel) 40 W per channel (8 )
Total power output in
stereo mode
Input sensitivity
AUX
MIC
Input Impedance
AUX
MIC
Specifications
40 W per channel (8 )
400 W
115 W
250 mV
0.7 mV
13 k
680
FM TUNER SECTION
Frequency range
Sensitivity
S/N 26 dB
Antenna terminal(s) 75 (unbalanced)
AM TUNER SECTION
Frequency range
Sensitivity
S/N 20 dB (at 999 kHz)
CASSETTE DECK
SECTION
87.50 - 108.00 MHz (50
kHz steps)
2.5 V (IHF)
2.2 V
522 - 1629 kHz (9 kHz
steps)
520 - 1630 kHz (10 kHz
steps)
560 V/m
2 2005-05-13
Track system
4 track, 2 channel
Heads
Record/playback
Erasure
Motor
Recording system
Erasing system
Tape speed
Solid permalloy head
Double gap ferrite head
DC servo motor
AC bias 100 kHz
AC erase 100 kHz
4.8 cm/s
Frequency response (+3 dB, -6 dB at DECK OUT)
NORMAL (TYPE I)
HIGH (TYPE II)
S/N
Wow and flutter
Fast forward and rewind
Approx. 120 seconds with
35 Hz - 14 kHz
35 Hz - 14 kHz
50 dB (A weighted)
0.18% (WRMS)
time
C-60 cassette tape
CD SECTION
Sampling frequency
Decoding
Beam source/wave length
Semiconductor laser/780
44.1 kHz
16 bit linear
nm
Number of channels
Frequency response
Wow and flutter
Digital filter
D/A converter
20 Hz - 20 kHz (+1, -2 dB)
Below measurable limit
MASH (1 bit DAC)
Stereo
8 fs
Video CD
Video data Based on MPEG 1
Audio data Based on MPEG 1 Layer 2
Video output
Video format NTSC/PAL
Output voltage 1 Vp-p, 75 k
Physical format Based on CD-ROM format
GENERAL
Power supply AC 110 V/127 V/220-230 V
/240V, 50/60 Hz
Power consumption
150 W
Power consumption in standby mode
0.9 W
Dimensions (W x H x D)
250 x 332 x 319 mm
Mass 9.0 kg
SYSTEM
SC-AK177 (GC) Music Center: SA-AK177
(GC)
Speaker: SB-AK77 (GC)
3 2005-05-13
Speaker
: SB-AK77
(
GC)
Center speaker: SB-
PC70A (GC)
Surround speaker: SB-
PS70A (GC)
Notes:
1. Specifications are subject to change without notice. Weight and
dimensions are approximate.
2. Total harmonic distortion is measured by the digital spectrum
analyzer.
3. HIGH stands for High Frequency. LOW stands for Low Frequency.
1
1. Before Use
Be sure to disconnect the mains cord before adjusting the voltage selector.
Use a minus(-) screwdriver to set the voltage selector (on the rear panel) to the
voltage setting for the area in which the unit will be used. (If the power supply in
your area is 117V or 120V, set to the “127V” position.)
Note that this unit will be seriously damaged if this setting is not made correctly.
(There is no voltage selector for some countries, the correct voltage is already
set.)
2. Before Repair and Adjustment
Disconnect AC power, discharge Power Supply Capacitors C572, C584-C587
through a 10 , 5W resistor to ground.
DO NOT SHORT-CIRCUIT DIRECTLY (with a screwdriver blade, for instance), as
this may destroy solid state devices.
After repairs are completed, restore power gradually using a variac, to avoid
overcurrent.
Current consumption at AC 110V, 50Hz and AC 240V, 50Hz in NO SIGNAL mode
should be ~600 mA.
4 2005-05-13
3. Protection Circuitry
The protection circuitry may have operated if either of the following conditions
are noticed:
- No sound is heard when the power is turned on.
- Sound stops during a performance.
The function of this circuitry is to prevent circuitry damage if, for example, the
positive and negative speaker connection wires are
“shorted”, or if speaker systems with an impedance less than the indicated rated
impedance of the amplifier are used.
If this occurs, follow the procedure outlines below:
1. Turn off the power.
2. Determine the cause of the problem and correct it.
3. Turn on the power once again after one minute.
Note:
When the protection circuitry functions, the unit will not operate unless the
power is first turned off and then on again.
4. Accessories
Remote Control Transmitter
FM indoor antenna
AC mains lead
5 2005-05-13
AM Loop antenna
Power plug adapter
6 2005-05-13
Video connection cable
5. Handling Precautions For Traverse Deck
The laser diode in the traverse deck (optical pickup) may break down due to
potential difference caused by static electricity of clothes or human body.
So, be careful of electrostatic breakdown during repair of the traverse deck
(optical pickup).
- Handling of traverse deck (optical pickup)
1. Do not subject the traverse deck (optical pickup) to static electricity as it is
extremely sensitive to electrical shock.
2. The short land between the No.4(LD) and No.5(GND) pins on the flexible board
(FFC) is shorted with a solder build-up to prevent damage to the laser
diode.To connect to the PC board, be sure to open by removing the solder
build-up, and finish the work quickly.
3. Take care not to apply excessive stress to the flexible board (FFC).
4. Do not turn the variable resistor (laser power adjustment). It has already been
adjusted.
7 2005-05-13
- Grounding for electrostatic breakdown prevention
1. Human body grounding
Use the anti-static wrist strap to discharge the static electricity from your
body.
2. Work table grounding
Put a conductive material (sheet) or steel sheet on the area where the
traverse deck (optical pickup) is placed, and ground the sheet.
Caution :
The static electricity of your clothes will not be grounded through the wrist
strap. So, take care not to let your clothes touch the traverse deck (optical
pickup).
Caution when Replacing the Traverse Deck :
The traverse deck has a short point shorted with solder to protect the laser
diode against electrostatics breakdown. Be sure to remove the solder from the
8 2005-05-13
short point before making connections.
6. Precaution of Laser Diode
Caution :
This product utilizes a laser diode with the unit turned "ON", invisible laser
radiation is emitted from the pick up lens.
Wavelength : 780 nm
Maximum output radiation power from pick up : 100 W/VDE
Laser radiation from pick up unit is safety level, but be sure the followings:
1. Do not disassemble the optical pick up unit, since radiation from exposed
laser diode is dangerous.
2. Do not adjust the variable resistor on the pick up unit. It was already adjusted.
3. Do not look at the focus lens using optical instruments.
4. Recommend not to look at pick up lens for a long time.
ACHTUNG :
Dieses Produkt enthält eine Laserdiode. Im eingeschalteten Zustand wird
unsichtbare Laserstrahlung von der Lasereinheit abgestrahlt.
Wellenlänge : 780nm
Maximale Strahlungsleistung der Lasereinheit :100 W/VDE
Die Strahlung an der Lasereinheit ist ungefährlich, wenn folgende Punkte
beachtet werden:
1. Die Lasereinheit nicht zerlegen, da die Strahlung an der freigelegten
Laserdiode gefährlich ist.
2. Den werkseitig justierten Einstellregler der Lasereinhit nicht verstellen.
9 2005-05-13
3. Nicht mit optischen Instrumenten in die Fokussierlinse blicken.
4. Nicht über längere Zeit in die Fokussierlinse blicken.
ADVARSEL: I dette a apparat anvendes laser.
PRODUCT UTILIZES A LASER.
OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE
HEREIN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.
Use of Caution Labels
10 2005-05-13
7. Operation Procedures
11 2005-05-13
12 2005-05-13
8. Disassembly and Main Component Replacement
Procedures
13 2005-05-13
“ATTENTION SERVICER”
Some chassis components may have sharp edges.
Be careful when disassembling and servicing.
1. This section describes procedures for checking the operation of the major
printed circuit boards and replacing the main components.
2. For reassembly after operation checks or replacement, reverse the respective
procedures.
Special reassembly procedures are described only when required.
3. Select items from the following index when checks or replacement are
required.
Contents
- Disassembly and assembly main unit
1. Checking of the Main, VCD, Panel, Deck and Power P.C.B.
- Main Component Replacement Procedures
1. Replacement of the Traverse Deck.
2. Replacement of the Power Amplifier IC.
- Disassembly and assembly of the Traverse Unit
- Disassembly and assembly of the Disc Tray
Warning:
This product uses a laser diode. Refer to caution statement Precaution of Laser
14 2005-05-13
Diode.
ACHTUNG:
Die Lasereinheit nicht zerlegen.
Die Lasereinheit darf nur gegen eine vom Hertsteller spezifizierte Einheit
ausgetauscht werden.
8.1. Disassembly Procedure For Each Major P.C.B. Checking
8.1.1. Checking of the Main, VCD, Transformer, Panel and Deck
P.C.B.
Step 2 Remove the top cabinet.
Step 3 Remove the T-bracket.
15 2005-05-13
16 2005-05-13
Step 5 Turn locating pin on both sides 90°. (Locating pin need not to be bent
back.)
17 2005-05-13
Step 6 Release the Main P.C.B. connectors CN305,CP402, CP403, CN204, CN205,
CP400,and VCD P.C.B. connectors CN802, CN 803. Remove rear panel by pulling
it backward and lift the rear panel assembly.
18 2005-05-13
Step 7 Use a hexagonal wrench and turn clockwise to release the tray.
19 2005-05-13
Step 8 Pull the CD tray in the direction shown above.
20 2005-05-13
Step 9 Remove the CD lid in the direction of the arrow.
21 2005-05-13
Step 11 Release the two catches shown above to remove the front cabinet from
the CD traverse unit.
22 2005-05-13
Step 12 Connect back the wire to CN302, CN303 and CN304. Use the extension
wire (REXX0261) to connect to CN502. Use a FFC wire (REEX0137) to connect
CN1 to CN309.
8.1.2. Checking for Panel, Main and Deck P.C.B.
23 2005-05-13
24 2005-05-13
Step 1 Remove 2 screws each side.
8.1.3. Checking for Power P.C.B.
25 2005-05-13
8.2. Main Component Replacement Procedures
1. Replacement of the Traverse Deck
Step 1 Follow the procedures in ‘Disassembly of the Traverse Unit’ ( Step 1 Step 4 )
26 2005-05-13
Step 3 Desolder the 4 legs of the 2 motors and pull out the Servo P.C.B.
Step 4 Widen the 3 bosses with a flat screwdriver and pull out the 3 pins. Then
remove the Traverse Deck.
27 2005-05-13
Step 5 Remove the flexible cable CN 701.
- Removal of the flexible cable. Push the top of the connector in the direction of
the arrow 1, and then pull out the flexible cable in the direction of the arrow 2.
Note:
Insert a short pin into the flexible cable for traverse unit.
- Installation of the CD servo P.C.B. after replacement
Step 1 Connect the FFC board.
Step 2 Install the CD servo P.C.B. in the traverse deck assembly.
28 2005-05-13
Note:
Before installing the CD servo P.C.B., move the optical pickup towards the outer
edge from the marking (black triangle). [Otherwise, the reset detect switch (S701)
mounted on the CD servo P.C.B. may be damaged.]
29 2005-05-13
2. Replacement of the Power Amplifier IC
Step 1 Follow the procedures in ‘Checking Procedure for each major P.C.B.’ (
Step 1 - Step 4 ).
Step 2 Remove the wires at CP400 and CP401 and pull out the Main P.C.B.
Step 3 Remove 4 screws fixed to the Power Amplifier IC.
30 2005-05-13
Loading...